German submarine U-9 (1935)
Ships attacked

Date
Name
Nationality
Tonnage
Fate
18 January 1940
Flandria
Sweden
1,179
Sunk
19 January 1940
Patria
Sweden
1,188
Sunk
11 February 1940
Linda
Estonia
1,213
Sunk
20 April 1940
ORP Błyskawica
Polish Navy
1,975
torpedo misfired, ship survived
4 May 1940
San Tiburcio
United Kingdom
5,995
Sunk (mine)
9 May 1940
Doris
French Navy
552
Sunk
11 May 1940
Tringa
United Kingdom
1,930
Sunk
11 May 1940
Viiu
Estonia
1,908
Sunk
23 May 1940
Sigurd Faulbaum
Belgium
3,256
Sunk
11 May 1944
Shtorm
Soviet Union
412
Damaged

Question: How many total tons has U-9 sunk or damaged?
Answer: U-9 sank eight ships totalling 17,221 gross register tons (GRT) and damaging 412 tons.